Improvement in piston-packings



UNITED STATES PATENT OEEI'CE.

JOHN JACOB MILLER, OF CHICAGO, ILLINOIS, ASSIGNOR TO HIMSELF AND ERNSTPRUSSING.

IMPROVEMENT IN PISTO'N-PACKINGS.

Specification forming part of Letters Patent No. 43,950. dated August23, 1864; antedatcd February I5, 1863.

To all whom 'Lt may concern Be it known that I, JOHN JACOB MiLLER, ofChicago, in the county of Cook and State of Illinois, have invented anew and useful improvement in packing and lubricating pistons,piston-rods, and other moving. parts of machinery; and I do herebydeclare the following to be a full and exact descriptionvof The subjectof my said invention is a packingconsistingof cylindrical segments ofmetal, wood, or other hard substance, combined with hemp or otherelastic and permeable material and suitable adjusting-screws, ashereinafter explained.

'lo enable others skilled in the art to which my invention appertains tofully understand and use the same, I will proceed to describe itsconstruction and operation.

A Al may represent the two heads of an expansible steam-piston, confinedby a nut, b, upon a rod, B.

C C C are segments, which may be constructed of metal, wood, glass, orany other suitable material, and in any desired number, f1tting inrabbets a in the heads A A.

D represents a mass of hemp or other analogous material tillin g theinterior of the piston around the rod B, between the heads A A andsegments C. In this form of the invention the joints between thesegments C are made close upon the periphery, but expand inward, so asto expose Wide openings toward the filling D.

E E are set-screws for adjusting the expansion of the piston by pressurewithin the tilliiig D acting' indirectly upon the metal segments.

The stuffing-box, which is also shown in Fig. 1, and by a transversesectional view in Fig. 3, illustrates anotherl form of my invention. Inthis case the filling D surrounds the segments C', the latter beingplaced around and in contact with the rod B. The segments are shown ofwood, but may be of any other suitable material. Their joints are formedto expand outward, so as to expose Wide openings to the llin g, asbefore explained. The adjustment is eected by setting in or out thesleeve E, which may be either threaded directl y into the cylinderheador secured thereto by screw-bolts in customary manner.

Operation In using this invention the illing D D is thoroughly saturatedwith oil or anyv lubricating material which may be preferred. The saidlubricating material flows from the lilling through the joints betweenthe segments, and is thus constantly supplied to the frictional surface.The compression of the llin g forces it into the joints between thesegments, so as to form acontinuous cylinder, bearing upon all parts ofthe surface in such a manner as to be steam, air, or water tight. Bysetting in the screws E or E the filling is still further compressed,which forces the segments in closer contact with the surface of thecylinder or rod, and at the same time expresses an additional quantityof oil through the joints between the segments. An additional yquantityot' hemp or oil may be introduced whenever requisite through theapertures occupied by the screws E and E.

It will be evident that the above-described invention is equallyapplicable to pumps and various other purposes Where moving parts ofmachinery are required to be protected against the iioW of fluids.

I do not desire to be understood as limiting myself to any specificform, size, thickness, number, or material of the segments, nor to anyparticular substance employed for the fibrous filling.

Having thus described my invention, what I claim therein as new, anddesire to secure by Letters Patent, is-

1. The combination of the fibrous or other elastic and permeable fillingD or Dl with segments C or C', formed with angular or expanding joints,substantially as and for the purposes explained.

2. 'lhe regulating-screws E or E', used in the described combinationWith the segments C or C', and filling D or D, constructed and operatingas explained.

JOHN JACOB MILLER.

Witnesses:

J OHN G. SHORTALL, ELY H. BREYTSPRAAK.

